Why GUI operating system is more popular than CUI based operating system ?

A GUI can display graphics, symbols and other visual cues as opposed to strictly text, unlike the CUI. GUIs are much easier to navigate, as they make the use of a mouse possible.Therefore GUI is more popular than CUI.

gateway user interface (GUL) is the reference that supported in windows CE.NET 4.2 has more friendly than common user interface (CUL).

Because GUI provide an interface between user and hardware of a system. It is more user friendly than CUI.